The first commercial Light Emitting Diode (LED) was introduced in the 1960s. From its early beginnings as a low intensity red light, the LED has emerged as a highly versatile component, critical to a wide variety of applications.
This application guide provides extensive information on various ways to power and control high brightness LEDs. The note covers many of the common problems encountered in powering LEDs, and includes a number of circuit diagrams illustrating input/output circuits; analog/PWM dimming & contol; and protection devices. Also included are a list of common terms and a short history of the development of the LED.
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.